From: Rusty Russell <rusty@rustcorp•com.au>
To: Tier Nolan <tier.nolan@gmail•com>
Cc: Bitcoin Development <bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] Proposed alternatives to the 20MB step function
Date: Sat, 16 May 2015 09:52:14 +0930 [thread overview]
Message-ID: <87a8x5l6bt.fsf@rustcorp.com.au> (raw)
In-Reply-To: <CAE-z3OUzYZDvsOYEDT229vnvNBa9ntW+86O3uA-K5-KaneMF_g@mail.gmail.com>
Tier Nolan <tier.nolan@gmail•com> writes:
> On Sat, May 9, 2015 at 4:36 AM, Gregory Maxwell <gmaxwell@gmail•com> wrote:
>
>> An example would
>> be tx_size = MAX( real_size >> 1, real_size + 4*utxo_created_size -
>> 3*utxo_consumed_size).
>
>
> This could be implemented as a soft fork too.
>
> * 1MB hard size limit
> * 900kB soft limit
I like this too.
Some tweaks:
1) Nomenclature: call tx_size "tx_cost" and real_size "tx_bytes"?
2) If we have a reasonable hard *byte* limit, I don't think that we need
the MAX(). In fact, it's probably OK to go negative.
3) ... or maybe not, if any consumed UTXO was generated before the soft
fork (reducing Tier's perverse incentive).
4) How do we measure UTXO size? There are some constant-ish things in
there (eg. txid as key, height, outnum, amount). Maybe just add 32
to scriptlen?
5) Add a CHECKSIG cost. Naively, since we allow 20,000 CHECKSIGs and
1MB blocks, that implies a cost of 50 bytes per CHECKSIG (but counted
correctly, unlike now).
This last one implies that the initial cost limit would be 2M, but in
practice probably somewhere in the middle.
tx_cost = 50*num-CHECKSIG
+ tx_bytes
+ 4*utxo_created_size
- 3*utxo_consumed_size
> A 250 byte transaction with 2 inputs and 2 outputs would have an adjusted
> size of 252 bytes.
Now cost == 352.
Cheers,
Rusty.
next prev parent reply other threads:[~2015-05-16 0:22 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-08 7:20 Matt Whitlock
2015-05-08 10:15 ` Mike Hearn
2015-05-08 10:30 ` Clément Elbaz
2015-05-08 12:32 ` Joel Joonatan Kaartinen
2015-05-08 12:48 ` Matt Whitlock
2015-05-08 13:24 ` Matt Whitlock
2015-05-08 12:48 ` Gavin Andresen
2015-05-08 16:51 ` Peter Todd
2015-05-08 22:36 ` Joel Joonatan Kaartinen
2015-05-09 18:30 ` Peter Todd
2015-05-08 15:57 ` Alex Mizrahi
2015-05-08 16:55 ` Bryan Bishop
2015-05-08 20:33 ` Mark Friedenbach
2015-05-08 22:43 ` Aaron Voisine
2015-05-08 22:45 ` Mark Friedenbach
2015-05-08 23:15 ` Aaron Voisine
2015-05-08 23:58 ` Mark Friedenbach
2015-05-09 3:36 ` Gregory Maxwell
2015-05-09 11:58 ` Gavin Andresen
2015-05-09 13:49 ` Tier Nolan
2015-05-10 17:36 ` Owen Gunden
2015-05-10 18:10 ` Mark Friedenbach
2015-05-10 21:21 ` Gavin Andresen
2015-05-10 21:33 ` Gregory Maxwell
2015-05-10 21:56 ` Rob Golding
2015-05-13 10:43 ` Tier Nolan
2015-05-16 0:22 ` Rusty Russell [this message]
2015-05-16 11:09 ` Tier Nolan
2015-05-18 1:42 ` Rusty Russell
2015-05-19 8:59 ` Tier Nolan
2015-05-10 21:48 ` Thomas Voegtlin
2015-05-10 22:31 ` Mark Friedenbach
2015-05-10 23:11 ` Thomas Voegtlin
2015-05-28 15:53 ` Gavin Andresen
2015-05-28 17:05 ` Mike Hearn
2015-05-28 17:19 ` Gavin Andresen
2015-05-28 17:34 ` Mike Hearn
2015-05-28 18:23 ` Gavin Andresen
2015-05-29 11:26 ` Mike Hearn
2015-05-29 11:42 ` Tier Nolan
2015-05-29 11:57 ` Mike Hearn
2015-05-29 12:39 ` Gavin Andresen
2015-05-29 14:00 ` insecurity
2015-05-29 14:15 ` Braun Brelin
2015-05-29 14:09 ` Tier Nolan
2015-05-29 14:20 ` Gavin Andresen
2015-05-29 14:22 ` Mike Hearn
2015-05-29 14:21 ` Mike Hearn
2015-05-29 14:22 ` Tier Nolan
2015-05-29 16:39 ` [Bitcoin-development] Proposed alternatives to the 20MB stepfunction Raystonn .
2015-05-29 18:28 ` Tier Nolan
2015-05-29 17:53 ` [Bitcoin-development] Proposed alternatives to the 20MB step function Admin Istrator
2015-05-30 9:03 ` Aaron Voisine
2015-06-01 11:30 ` Ricardo Filipe
2015-06-01 11:46 ` Marcel Jamin
2015-05-29 18:47 ` Bryan Cheng
2015-05-30 1:36 ` Cameron Garnham
2015-05-28 17:39 ` [Bitcoin-development] Proposed alternatives to the 20MB stepfunction Raystonn .
2015-05-28 17:59 ` Pieter Wuille
2015-05-28 18:21 ` Gavin Andresen
2015-05-28 17:50 ` [Bitcoin-development] Proposed alternatives to the 20MB step function Peter Todd
2015-05-28 17:14 ` Thomas Voegtlin
2015-05-28 17:34 ` Pieter Wuille
2015-05-29 17:45 ` Aaron Voisine
2015-05-08 14:57 Steven Pine
2015-05-09 0:13 Raystonn
[not found] <CAAjy6kDdB8uODpPcmS8h4eap8fke7Y2y773NHJZja8tB5mPk4Q@mail.gmail.com>
2015-05-28 16:30 ` Steven Pine
[not found] ` <CABsx9T03aNRC5DRbR06nNtsiBdJAcQsGAHvbCOe3pnuRpdvq5w@mail.gmail.com>
2015-05-28 18:25 ` Steven Pine
2015-05-28 18:31 ` Gavin Andresen
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